Initial commit need to add nix code to setup service and timer example service and timer are provided

main.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+type Update struct {
+	Version   string `json:"version"`
+	Build     string `json:"build"`
+	Published string `json:"published"`
+}
+
+const (
+	updateURL      = "http://127.0.0.1:3000/updates"
+	stateFilePath  = "latest_version.txt"
+)
+func main() {
+	resp, err := http.Get(updateURL)
+	if err != nil {
+		fmt.Printf("Failed to fetch updates: %v\n", err)
+		return
+	}
+	defer resp.Body.Close()
+
+	body, _ := io.ReadAll(resp.Body)
+
+	var updates []Update
+	err = json.Unmarshal(body, &updates)
+	if err != nil {
+		fmt.Printf("Failed to parse response: %v\n", err)
+		return
+	}
+
+	if len(updates) == 0 {
+		fmt.Println("No updates found.")
+		return
+	}
+
+	latest := updates[0].Version
+
+	prevVersion := ""
+	if data, err := os.ReadFile(stateFilePath); err == nil {
+		prevVersion = strings.TrimSpace(string(data))
+	}
+
+	if prevVersion == "" {
+		fmt.Println("No previous version found. Storing latest:", latest)
+		_ = os.WriteFile(stateFilePath, []byte(latest), 0644)
+		return
+	}
+
+	if versionCompare(latest, prevVersion) > 0 {
+		fmt.Printf("New version found! %s > %s\n", latest, prevVersion)
+
+		// Run steamcmd with reforger_update script
+		fmt.Println("Running update command...")
+		cmd := exec.Command("./steamcmd.sh", "+runscript", "reforger_update")
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		err := cmd.Run()
+		if err != nil {
+			fmt.Printf("Update command failed: %v\n", err)
+			return
+		}
+
+		// Store the new latest version
+		_ = os.WriteFile(stateFilePath, []byte(latest), 0644)
+	} else {
+		fmt.Printf("No new version. Latest seen: %s\n", prevVersion)
+	}
+}
+
+func versionCompare(a, b string) int {
+	segA := strings.Split(a, ".")
+	segB := strings.Split(b, ".")
+
+	max := len(segA)
+	if len(segB) > max {
+		max = len(segB)
+	}
+
+	for i := 0; i < max; i++ {
+		var ai, bi int
+		if i < len(segA) {
+			fmt.Sscanf(segA[i], "%d", &ai)
+		}
+		if i < len(segB) {
+			fmt.Sscanf(segB[i], "%d", &bi)
+		}
+
+		if ai > bi {
+			return 1
+		}
+		if ai < bi {
+			return -1
+		}
+	}
+	return 0
+}
+